/*
	QMPlay2 is a video and audio player.
	Copyright (C) 2010-2017  Błażej Szczygieł

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include <AudioFilter.hpp>

struct FFTContext;
struct FFTComplex;

class Equalizer final : public AudioFilter
{
public:
	static QVector<float> interpolate(const QVector<float> &, const int);
	static QVector<float> freqs(Settings &);
	static float getAmpl(int val);

	Equalizer(Module &);
	~Equalizer();

	bool set() override;
private:
	bool setAudioParameters(uchar, uint) override;
	int bufferedSamples() const override;
	void clearBuffers() override;
	double filter(Buffer &data, bool flush) override;

	/**/

	void alloc(bool);
	void interpolateFilterCurve();

	int FFT_NBITS, FFT_SIZE, FFT_SIZE_2;

	uchar chn;
	uint srate;
	bool canFilter, hasParameters, enabled;

	mutable QMutex mutex;
	FFTContext *fftIn, *fftOut;
	FFTComplex *complex;
	QVector<QVector<float>> input, last_samples;
	QVector<float> wind_f, f;
	float preamp;
};

#define EqualizerName "Audio Equalizer"
